CourseCourseConceptConceptDocumentDocument

CAIE IGCSE Physics 5.2.4.3 Isotope Choice Using Radiation Type Questions

Learn to match alpha, beta and gamma emissions to their penetration, ionisation and half-life requirements.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • select alpha for short-range ionisation applications such as smoke alarms
  • select beta for thickness control when partial absorption varies with thickness
  • select penetrating gamma and a suitable half-life for sterilisation, tracers or treatment

CAIE IGCSE Physics 5.2.4.3 Isotope Choice Using Radiation Type Questions question 1

[Maximum number: 2]

Leaks in underground water pipes are detected using radioactive tracers. Fig. 10.1 shows a radiation detector above a water pipe.

Fig. 10.1

Fig. 10.1

Question (a)

(a)

Explain why the radioactive isotope must not have a very short half-life.

[ 1 ]

Question (b)

(b)

Explain why the radioactive isotope must not have a very long half-life.
[Total: 9]

[ 1 ]
All question bank results loaded